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Mankato Clinic

listed as mankatoclinic.com · Claimed by Chaos · listed 3 days ago

2d
Age
since listed · data leaked

Status timeline

  1. ListedSep 10, 2026
  2. Data leakeddate unknown

At a glance

Group
Chaos
Status
Data leaked
Country
United States
Sector
Healthcare
Listed on leak site
Sep 10, 2026

About the victim

AI dossier — public-source company profile

Mankato Clinic is a comprehensive multi-specialty medical group practice founded in 1916 in Mankato, Minnesota. The clinic provides primary care, specialty services including dermatology, ENT, OB/GYN, pediatrics, and urgent care to residents of southern Minnesota.

Industry
Healthcare - Multi-specialty Medical Clinic
Address
1230 East Main Street, Mankato, MN 56001
Founded
1916

Attack summary

Severity: high — Healthcare provider with confirmed data publication by threat actor. Patient records and medical data are regulated (HIPAA) and highly sensitive. Lack of specific proof count or detailed data inventory prevents 'critical' classification, but the healthcare sector and confirmed publication justify 'high'.

The Chaos group claims to have attacked Mankato Clinic and published data. The leak post does not specify whether data was encrypted, exfiltrated, or both, nor does it detail what data types were compromised.

high

What the group claims

The Mankato Clinic was founded Mankato, Minnesota in 1916, by five area physicians who believed that a comprehensive, multi-specialty group practice offered the best means of providing quality health care to the residents of southern Minnesota. The mission of the Mankato Clinic is to improve the hea…

Sources

Source

Indexed 3 days ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.

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Disclosure context

About chaos

Based on the limited publicly available information, Chaos is a recently emerged ransomware group that was first observed in March 2025, appearing to be financially motivated given their ransom demands and targeting patterns. The group's origin and specific affiliations remain unclear due to their recent emergence, though their operational model and whether they operate as Ransomware-as-a-Service or as an independent entity has not been definitively established by security researchers. Their attack methodology and specific technical capabilities are not yet well-documented in public threat intelligence reports, though their targeting suggests they employ common initial access vectors to compromise victims across multiple sectors. Chaos has claimed 41 victims primarily concentrated in the United States, Germany, Poland, Malaysia, and Sweden, with a particular focus on technology companies, financial services, business services, and manufacturing sectors, though the scope and impact of their most significant attacks have not been widely publicized. The group currently appears to be active based on recent victim claims, though comprehensive analysis from major security firms regarding their long-term operational capabilities and potential law enforcement actions remains limited due to their recent emergence in the threat landscape. The group has been linked to 89 public disclosures across our corpus. First observed on a leak site on March 31, 2025; most recent post September 10, 2026. The operation is currently active.

Timeline of this disclosure

  • September 10, 2026mankatoclinic.com listed by chaos on the group's public leak site

Other recent disclosures by chaos

chaos has been linked to 89 public victims on Darkfield. A sample of the most recent:

See the full chaos dossier →

Sector and geography

This disclosure adds to ransomware activity in the Healthcare sector, which has 2,608 disclosures indexed across all operators we track. Geographically, mankatoclinic.com is reported in United States, a country with 3,165 ransomware disclosures in our corpus.

If your organisation is affected

A listing by chaos means mankatoclinic.com appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

  • Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
  • Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
  • Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
  • Report the incident to your national CERT, CISA (United States), as required for your jurisdiction.
  • Monitor for the data appearing on chaos's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.